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<?php |
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namespace Aoe\Asdis\Domain\Model\DistributionAlgorithm; |
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use Aoe\Asdis\Domain\Model\Asset; |
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use Aoe\Asdis\Domain\Model\Asset\Collection as AssetCollection; |
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use Aoe\Asdis\Domain\Model\DistributionAlgorithm\DistributionAlgorithmInterface; |
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use Aoe\Asdis\Domain\Model\Server\Collection as ServerCollection; |
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/** |
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* A distribution algorithm which is based on the assets hashed filenames. |
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*/ |
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class HashBasedGroups implements DistributionAlgorithmInterface |
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{ |
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/** |
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* @var string |
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*/ |
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const UNKNOWN_GROUP_KEY = 'unknown'; |
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/** |
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* @var \Aoe\Asdis\Domain\Model\Server\Collection |
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*/ |
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private $servers; |
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/** |
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* @var string |
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*/ |
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private $characters = '0123456789abcdef'; |
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/** |
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* @var array |
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*/ |
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private $groups; |
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/** |
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* Distributes the given assets to the given servers. |
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* |
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* @param \Aoe\Asdis\Domain\Model\Asset\Collection $assets |
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* @param \Aoe\Asdis\Domain\Model\Server\Collection $servers |
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* @return void |
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*/ |
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public function distribute(AssetCollection $assets, ServerCollection $servers) |
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{ |
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if ($servers->count() < 1) { |
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return; |
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} |
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$this->groups = []; |
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$this->servers = $servers; |
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$this->buildGroups(); |
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foreach ($assets as $asset) { |
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/** @var \Aoe\Asdis\Domain\Model\Asset $asset */ |
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$asset->setServer($this->groups[$this->getGroupCharacter($asset)]); |
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} |
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} |
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/** |
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* @return \Aoe\Asdis\Domain\Model\Server |
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*/ |
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private function getNextServer() |
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{ |
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$server = $this->servers->current(); |
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$this->servers->next(); |
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if (FALSE === $this->servers->valid()) { |
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$this->servers->rewind(); |
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} |
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return $server; |
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} |
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/** |
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* @return void |
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*/ |
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private function buildGroups() |
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{ |
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$serverCount = $this->servers->count(); |
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$charCount = strlen($this->characters); |
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for($i = 0; $i < $charCount; $i++) { |
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$this->groups[$this->characters[$i]] = $this->getNextServer(); |
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} |
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$this->groups[self::UNKNOWN_GROUP_KEY] = $this->getNextServer(); |
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} |
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/** |
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* @param \Aoe\Asdis\Domain\Model\Asset $asset |
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* @return string |
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*/ |
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private function getGroupCharacter(Asset $asset) |
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{ |
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$hash = md5(sha1($asset->getNormalizedPath())); |
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$character = $hash[strlen($hash) - 3]; |
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if (false === strpos($this->characters, $character)) { |
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return self::UNKNOWN_GROUP_KEY; |
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} |
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return $character; |
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} |
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} |
AOEpeople /
asdis
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